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php验证码:php的验证码函数

实现上下左右随即浮动，字符+数字，随机干扰线 session_start(); $image = imagecreatetruecolor(58,22); $color_Background = imagecolorallocate($image,255,255,255); imagefill($image,0,0,$color_Background); $key = array( '0','1','2','3','4','5','6','7','8','9', 'a','b','c','d','e','f','g','h','i','j','k','l' [阅读全文] [PDF]